Quote:
Originally Posted by Jeff Hail
The FCW Marvel type 1 upper slides are producing 1 inch groups at 50 yards with a Ransom rest. Thats with a 22 LR cartridge. The type 2 is not far behind that.
Good luck with that using a Ruger Mark IV.
Model 41's with some tweaking are in the same accuracy territory as the type 1's as well as Pardini, Hämmerli 208s, Benelli MP90S, Walther GSP, Toz, Feinwerkbau AW93.
A weighted frame is key in this kind of competition. A 45 frame is ideal. The accuracy comes from mechanically locking the barrel to the frame. The 22 conversion barrrels do not tilt like some semi auto loaders. Blowback from the case just nudges the slide back, unfired round comes up and inserts into the chamber. Rinse and repeat.
The accuracy game is like car tuners.
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That, plus a linear pull trigger vs pivot style.
Quote:
Originally Posted by flatbutt
maybe a stiffer spring? Is the follower getting hung up on a blem?
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Not familiar w/the followers in these magazines, but I've found (esp. w/rimfire mags) that if the follower tilts a little bit too much -- either nose-high or rim-high -- a failure-to-feed will typically show up w/the last round in the mag. May be worth another disassembly to make sure no burrs or blems in the upper part of the mag body, or adjust the follower if it has bendable fore/aft tabs.
As for the spring, you might consider using a shim or two. I've had good luck w/plastic card stock (e.g., hotel keys).
Good luck.